| 冷金属过渡搭接焊镁铝异种金属接头组织及性能 |
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| 引用本文： | 尚晶,王克鸿,田宏军,周琦,李广乐.冷金属过渡搭接焊镁铝异种金属接头组织及性能[J].焊接学报,2011,32(12):41-45. |
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| 作者姓名： | 尚晶 王克鸿 田宏军 周琦 李广乐 |
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| 作者单位： | 1. 南京理工大学材料科学与工程学院,南京,210094
2. 国营5103厂,南召,474650 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 采用冷金属过渡（CMT）焊接工艺，以HS201铜焊丝作为焊缝填充金属对AZ3l镁合金和6061铝合金进行搭接焊接．测试了接头的抗剪强度和显微硬度，并利用光学显微镜（OM）、扫描电镜（SEM）、能谱（EDS）对接头的组织成分及断口形貌进行了分析．结果表明，当焊接电流为109A，电弧电压10．9V，送丝速度4．9mm／s，...
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| 关 键 词： | 冷金属过渡焊 铝合金 镁合金 异种金属焊接 金属问化合物 |
| 收稿时间： | 2011/7/8 0:00:00 |
Study on cold metal transfer welded lap joints of Mg/Al dissimilar metals |
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| SHANG Jing,WANG Kehong,TIAN Hongjun,ZHOU Qi and LI Guangle.Study on cold metal transfer welded lap joints of Mg/Al dissimilar metals[J].Transactions of The China Welding Institution,2011,32(12):41-45. |
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| Authors: | SHANG Jing WANG Kehong TIAN Hongjun ZHOU Qi and LI Guangle |
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| Affiliation: | School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China,School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China,State-owned 5103 Factory, Nanzhao 474650, China,School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China and School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
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| Abstract: | AZ31B magnesium alloy and 6061 aluminum alloy were welded by cold metal transfer(CMT) welding method with pure copper(HS201) as the filler metal. Shear strength and micro-hardness of the lap joint were tested. The microstructure and fracture morphology of joint were studied by means of scanning electron microscope(SEM) and energy dispersive Xray(EDX). The results showed that good weld with the highest shear bonding strength of 27.9MPa was obtained under the welding current of 109 A, welding voltage of 10.9 V, wire feed speed of 4.9 mm/s, welding speed of 0.45 m/min. Intermetallic compounds of Mg2Cu and MgCu2 were formed in the Mg-Cu side where was oxidized. Al-Cu-Mg ternary intermetallic compounds and Al2Cu were formed on the Al-Cu side. Micro-hardness in both sides of fusion zone was suddenly increased due to intermetallic compounds. Maximum micro-hardness of Al-Cu side and Mg-Cu side were 242 HV and 347 HV respectively. The fracture occurred in the fusion zone of Mg side, and fracture nature was brittle fracture. Oxidation in the welding process and plenty of intermetallic compounds distributed continuously in the fusion zone, and resulted in the fracture. |
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| Keywords: | cold metal transfer welding: aluminum alloy magnesium alloy dissimilar metals welding intermetallic compounds |
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